- Support is improved for supplying a :func:`.join` construct as the

target of :paramref:`.relationship.secondary` for the purposes
of creating very complex :func:`.relationship` join conditions.
The change includes adjustments to query joining, joined eager loading
to not render a SELECT subquery, changes to lazy loading such that
the "secondary" target is properly included in the SELECT, and
changes to declarative to better support specification of a
join() object with classes as targets.

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/sqlalchemy/ext/declarative/clsregistry.py b/lib/sqlalchemy/ext/declarative/clsregistry.py
index fda1cffb5..8b846746f 100644
--- a/lib/sqlalchemy/ext/declarative/clsregistry.py
+++ b/lib/sqlalchemy/ext/declarative/clsregistry.py
@@ -14,6 +14,7 @@ from ...orm.properties import ColumnProperty, RelationshipProperty, \
 from ...schema import _get_table_key
 from ...orm import class_mapper, interfaces
 from ... import util
+from ... import inspection
 from ... import exc
 import weakref
 
@@ -207,6 +208,9 @@ class _GetColumns(object):
                                 " directly to a Column)." % key)
         return getattr(self.cls, key)
 
+inspection._inspects(_GetColumns)(
+            lambda target: inspection.inspect(target.cls))
+
 
 class _GetTable(object):
     def __init__(self, key, metadata):